Enhance Bun integration in Jenkinsfile

- Introduced helper functions to manage Bun installation paths for both Unix and Windows environments.
- Wrapped Bun installation and dependency setup stages in a new `withBun` closure for improved readability and organization.
- Ensured consistent handling of Bun installation across different stages of the CI pipeline.

Jenkinsfile

@@ -2,6 +2,20 @@ properties([
     buildDiscarder(logRotator(numToKeepStr: '20'))
 ])
 
+def bunBinDir() {
+    if (isUnix()) {
+        return "${env.HOME}/.bun/bin"
+    }
+    return "${env.USERPROFILE}/.bun/bin"
+}
+
+def withBun(Closure body) {
+    def sep = isUnix() ? ':' : ';'
+    withEnv(["PATH=${bunBinDir()}${sep}${env.PATH}"]) {
+        body()
+    }
+}
+
 def ensureBunInstalled() {
     if (isUnix()) {
         sh '''
@@ -13,14 +27,12 @@ def ensureBunInstalled() {
             fi
             bun -v
         '''
-        env.PATH = "${env.HOME}/.bun/bin:${env.PATH}"
     } else {
         bat '''
-            where bun >nul 2>nul || powershell -c "irm bun.sh/install.ps1 | iex"
+            where bun >nul 2>nul || %SystemRoot%/System32/WindowsPowerShell/v1.0/powershell.exe -NoProfile -ExecutionPolicy Bypass -Command "irm bun.sh/install.ps1 | iex"
             set PATH=%USERPROFILE%/.bun/bin;%PATH%
             bun -v
         '''
-        env.PATH = "${env.USERPROFILE}/.bun/bin;${env.PATH}"
     }
 }
 
@@ -43,6 +55,7 @@ def buildLinux() {
                 checkout scm
             }
 
+            withBun {
                 stage('Setup Bun (Ubuntu)') {
                     ensureBunInstalled()
                 }
@@ -58,6 +71,7 @@ def buildLinux() {
                 stage('Build (Ubuntu)') {
                     sh "VITE_BUILD_NUMBER=${env.BUILD_NUMBER} NODE_ENV=production bun run build:linux"
                 }
+            }
 
             stage('Archive Artifacts (Ubuntu)') {
                 archiveArtifacts artifacts: 'app_dist/**/*.deb, app_dist/**/*.rpm', fingerprint: true
@@ -75,6 +89,7 @@ def buildOnLabel(label, buildCommand) {
                 checkout scm
             }
 
+            withBun {
                 stage("Setup Bun (${label})") {
                     ensureBunInstalled()
                 }
@@ -98,6 +113,7 @@ def buildOnLabel(label, buildCommand) {
                         bat "set VITE_BUILD_NUMBER=${env.BUILD_NUMBER} && set NODE_ENV=production && ${buildCommand}"
                     }
                 }
+            }
 
             stage("Archive Artifacts (${label})") {
                 archiveArtifacts artifacts: 'app_dist/**/farmcontrol-server-*', fingerprint: true
@@ -110,6 +126,7 @@ def setBuildNameFromPackageVersion() {
     node('ubuntu') {
         stage('Set Build Name') {
             checkout scm
+            withBun {
                 ensureBunInstalled()
                 def version = sh(
                     script: "bun --eval \"console.log(JSON.parse(await Bun.file('package.json').text()).version)\"",
@@ -120,6 +137,7 @@ def setBuildNameFromPackageVersion() {
                 echo "Build name set to: ${buildName}"
             }
         }
+    }
 }
 
 try {